ForHosting KIT · Unit converters

Magnetic flux density converter

Switch a magnetic field reading between SI and CGS: 1 tesla is exactly 10,000 gauss and 10,000,000 milligauss. Enter tesla, millitesla, gauss, milligauss or Wb/m² and get all five at once, for site surveys, sensor sheets and coursework. Free in your browser.

Free
Runs in your browser
No sign-up
Your data stays on your device

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Worked example

If you enter

Amount: 1
Input unit: tesla
Output unit: gauss

You get

Result: 10,000
Tesla: 1
Millitesla: 1,000
Gauss: 10,000

Magnetic flux density conversion between SI tesla scales and the still-common CGS gauss family is a daily chore in electromagnetics labs, MRI and NMR site surveys, geomagnetic and space-weather reports, sensor datasheets, and secondary-school physics homework. People search for a magnetic flux density converter when they need tesla next to gauss, millitesla next to milligauss, or weber per square meter next to tesla, not a general multi-unit toolbox that also handles length and temperature. This capability accepts one finite amount plus from and to unit labels among tesla, millitesla, gauss, milligauss, and weber per square meter, bridges every conversion through the tesla so results stay consistent, and returns the target value together with the same B-field expressed in all five units. Unrecognized unit names are rejected with a clear validation error instead of silently guessing a nearby symbol.

How the magnetic flux density converter maps SI and CGS units through tesla

Start from the tesla as the SI coherent unit of magnetic flux density B and express every other unit as a fixed factor into tesla. One millitesla is exactly one thousandth of a tesla. One gauss is exactly one ten-thousandth of a tesla because the historical CGS definition sets ten thousand gauss equal to one tesla; one milligauss is one thousandth of a gauss and therefore one ten-millionth of a tesla.

One weber per square meter is identical to one tesla by the SI definition of the tesla itself, so Wb/m² and T share the same numerical magnitude even though people write both symbols on datasheets and exam papers. This calculator never mixes those paths ad hoc. It multiplies the input amount by the factor of the source unit to reach tesla, then divides by the factor of the target unit to produce the result.

Because every path shares the same intermediate, converting one tesla to ten thousand gauss and back, or comparing millitesla to milligauss, stays numerically consistent within ordinary floating-point precision. The tool does not convert magnetic field strength H in amperes per meter or oersted, does not convert magnetic flux in weber without an area, does not compute Lorentz force or permeability products, and does not fetch live magnetometer databases.

It answers only the algebraic magnetic flux density unit conversion people mean when they type magnetic flux density converter into a search bar and expect tesla, millitesla, gauss, milligauss, and Wb/m².

Where dedicated magnetic flux density conversion shows up in real work

Secondary-school and college physics courses constantly assign problems that give a magnetic field on one scale and ask for another, often mixing lab-style gauss with SI tesla and millitesla in the same worksheet. MRI and medical-physics teams quote fringe fields in millitesla or gauss while design tools and SI-native models expect tesla, so a single conversion pass keeps safety zones, site plans, and sensors aligned.

Geomagnetic and space-weather pipelines report the ambient field in nanotesla-class magnitudes often labeled as milligauss or gauss on older instruments, and need consistent SI export before stacking with satellite products. Sensor and Hall-effect manufacturers publish full-scale ranges in mT or G; procurement and test scripts normalize those ranges into one unit before comparing parts.

If you later need magnetic force on a moving charge, general multi-category unit conversion, or magnetic field strength H alone, treat those as separate search intents and landings rather than overloading this magnetic flux density converter page.

What you can do with it

Lab and sensor datasheets

Normalize Hall, fluxgate, and magnetometer full-scale ranges among tesla, millitesla, and gauss so SI reports and legacy CGS labels stay consistent.

MRI site surveys and safety zones

Convert fringe-field isocontours between millitesla and gauss for posters, floor plans, and SI design models without hand-written factors.

FAQ

What happens if I send an unrecognized unit?

The error message includes Unrecognized unit and lists the supported families so you can correct the label.

How many gauss are in one tesla?

Exactly 10_000 gauss. One gauss is 1×10⁻⁴ T, and one milligauss is 1×10⁻⁷ T.

What does it cost?

The browser tool is free and runs locally.

How many gauss is one millitesla?

One millitesla is exactly 10 gauss. A tesla is 10,000 gauss and a millitesla is a thousandth of a tesla, so the ten follows directly. One gauss in turn equals 1000 milligauss.

Is a tesla the same as a weber per square meter?

Yes. One weber per square meter is one tesla by the definition of the tesla itself, so both symbols carry the same number. Datasheets and exam papers simply use either one.

Related tools

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/conv/magnetic-flux-density

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/conv/magnetic-flux-density \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"amount":1,"from":"tesla","to":"gauss"}'

const res = await fetch("https://api.kit.forhosting.com/conv/magnetic-flux-density", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "amount": 1,
    "from": "tesla",
    "to": "gauss"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/conv/magnetic-flux-density",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "amount": 1,
    "from": "tesla",
    "to": "gauss"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/magnetic-flux-density", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"amount":1,"from":"tesla","to":"gauss"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"amount":1,"from":"tesla","to":"gauss"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/magnetic-flux-density", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "amount": 1,
  "from": "tesla",
  "to": "gauss"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "conv.magnetic_flux_density",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Technical notes

What you send and what you get back from the API and browser form

Send three fields: amount, a finite number for the magnetic flux density magnitude; from, a string naming the input unit; and to, a string naming the output unit. When a unit string is unknown the error message includes Unrecognized unit and lists the five supported families so clients can fix the label rather than guessing. Classic checks include one tesla becoming ten thousand gauss, one millitesla becoming ten gauss, one gauss becoming one thousand milligauss, and one weber per square meter matching one tesla exactly. Both unit fields accept short keys and everyday words in any common casing, including tesla or T, millitesla or mT or milli_tesla, gauss or G or Gs, milligauss or mG or milli_gauss, and wb_m2 or Wb/m2 or weber per square meter. Missing fields, non-numeric amount strings, NaN, Infinity, and unrecognized unit labels fail with invalid_input and are not charged. On success the response echoes the cleaned amount, normalized from and to keys, the primary result in the target unit, the same density as tesla, millitesla, gauss, milligauss, and wb_per_m2 with twelve significant digits of stable precision, the SI factors used, the formula string, and method tesla_bridge. Pricing for successful API calls is the published base of $0.002 per item; validation failures do not consume prepaid balance.

Where dedicated magnetic flux density conversion shows up in real work

Data pipelines that ingest mixed IoT or lab payloads with T, mT, G, and mG tags can call this capability once per reading instead of reimplementing the factors in every service. Because this capability is a pure parse engine, API pricing is the published base of $0.002 per successful item and failed validation does not consume balance.

Integration use cases

Homework and curriculum tools

Map exam values between T, G, mG, and Wb/m² for answer keys, auto-graders, and interactive physics demos that share one JSON contract.

Technical questions

Which magnetic flux density units does this converter support?

Tesla (T), millitesla (mT), gauss (G), milligauss (mG), and weber per square meter (Wb/m², wb_m2). Common aliases such as T, mT, G, mG, and weber per square meter are accepted; the response normalizes to short keys.

Is one tesla the same as one weber per square meter?

Yes. By SI definition 1 T = 1 Wb/m² exactly. This converter keeps both labels so you can match the symbol on a datasheet or exam paper.

Read the full KIT documentation →

Run — free

Worked example

How the magnetic flux density converter maps SI and CGS units through tesla

Where dedicated magnetic flux density conversion shows up in real work

What you can do with it

Lab and sensor datasheets

MRI site surveys and safety zones

FAQ

Related tools

For developers — API access

API endpoint

Call it from your stack

Example request

Example response

Pricing

Errors

Technical notes

What you send and what you get back from the API and browser form

Where dedicated magnetic flux density conversion shows up in real work

Integration use cases

Homework and curriculum tools

Technical questions

thank you